Manage Dimension Style unknown key-in or command

Hello,

When I select a Manage Dimension Styles icon or ribbon command, I receive the message "Unknown key-in or command" in the Message Center, and obviously, no dialog box appears to make edits to my dimension styles.  This started when I upgraded MSC to Update 17, version 10.17.02.61.  Anyone out there with an answer?  Thanks!

Tim Wall